diff options
| author | hselasky <hselasky@FreeBSD.org> | 2015-10-30 14:50:29 +0000 |
|---|---|---|
| committer | hselasky <hselasky@FreeBSD.org> | 2015-10-30 14:50:29 +0000 |
| commit | 232f7e59dfdfb0b4695e73ef77162336c2931fe7 (patch) | |
| tree | aa287fa07797a5e3b925190b64a9a450bf9c29cf | |
| parent | 5e057d29086245855ba89118eb697cab393b48ef (diff) | |
| download | FreeBSD-src-232f7e59dfdfb0b4695e73ef77162336c2931fe7.zip FreeBSD-src-232f7e59dfdfb0b4695e73ef77162336c2931fe7.tar.gz | |
Reduce the DWC OTG interrupt load by not reading all the host channel
status registers for every interrupt. Check a common host channel
status interrupt register first, then conditionally read the
individual host channel status registers.
Submitted by: Sebastian Huber <sebastian.huber@embedded-brains.de>
MFC after: 1 week
| -rw-r--r-- | sys/dev/usb/controller/dwc_otg.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sys/dev/usb/controller/dwc_otg.c b/sys/dev/usb/controller/dwc_otg.c index e018ab5..6243d8e 100644 --- a/sys/dev/usb/controller/dwc_otg.c +++ b/sys/dev/usb/controller/dwc_otg.c @@ -2558,6 +2558,7 @@ dwc_otg_interrupt_poll_locked(struct dwc_otg_softc *sc) struct usb_xfer *xfer; uint32_t count; uint32_t temp; + uint32_t haint; uint8_t got_rx_status; uint8_t x; @@ -2575,14 +2576,18 @@ repeat: DPRINTF("Yield\n"); return; } + /* get all host channel interrupts */ - for (x = 0; x != sc->sc_host_ch_max; x++) { + haint = DWC_OTG_READ_4(sc, DOTG_HAINT); + while (1) { + x = ffs(haint) - 1; + if (x >= sc->sc_host_ch_max) + break; temp = DWC_OTG_READ_4(sc, DOTG_HCINT(x)); - if (temp != 0) { - DWC_OTG_WRITE_4(sc, DOTG_HCINT(x), temp); - temp &= ~HCINT_SOFTWARE_ONLY; - sc->sc_chan_state[x].hcint |= temp; - } + DWC_OTG_WRITE_4(sc, DOTG_HCINT(x), temp); + temp &= ~HCINT_SOFTWARE_ONLY; + sc->sc_chan_state[x].hcint |= temp; + haint &= ~(1U << x); } if (sc->sc_last_rx_status == 0) { |
